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A.always less than atmospheric pressure
B.always unity
C.an index of molecular position of gas
D.dimensionless
An elastic sphere of 0.5 m diameter contains a gas at 115 k Pa. Heating of the sphere causes it to increase to 0.62 m and during the process the pressure is proportional to the sphere diameter. The work done by the gas will be
A.7.7 kJ
B.9.9 kJ
C.11 kJ
D.15 kJ
The dew point temperature of humid air is
A.always higher than the wet bulb temperature
B.never lower than the wet bulb temperature
C.the temperature of air obtained on cooling it till saturation at constant pressure
D.the temperature of air obtained on cooling it till saturation at constant volume
When two gases are not under the same conditions of temperature and pressure, upon mixing there will be
A.loss of entropy to the surroundings
B.exchange of entropy between the two gases
C.increase in available heat but decrease in unavailable heat
D.None of the above
According to Amagat’s law
A.the sum of the volume friction is unity
B.there would be no volume change if the components are mixed while holding the temperature and pressure constant
C.all diatomic gases occupy double the volume of monoatomic gases for identical masses
D.None of the above
In which of the following energy conversion takes place at ambient temperature?
A.Magnetohydrodynamic conversion
B.Thermionic generator
C.Battery producing electrical energy
D.Solar radiation
Which of the following relation does not hold good for a throttling process?
A.dW = 0
B.dQ = 0
C.dH = 0
D.dS = 0